Home / 143,430.40-215,145.60-77,075.20

Finding the Fourth Proportional to 143,430.40, 215,145.60 and 77,075.20

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Solution

The fourth proportional to 143,430.40, 215,145.60 and 77,075.20 is: 115,612.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,430.40 : 215,145.60 = 77,075.20 : x
  2. Step 2: Convert to fraction form
    143,430.40/215,145.60 = 77,075.20/x
  3. Step 3: Cross multiply
    143,430.40x = 215,145.60 × 77,075.20
  4. Step 4: Simplify right side
    143,430.40x = 16,582,390,149.12
  5. Step 5: Solve for x
    x = 16,582,390,149.12/143,430.40
  6. Step 6: Final answer
    x = 115,612.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.